AL SERIES INSTALL OPERATION MAINTENANCE MANUAL
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4.4 WATER CHECKS
4.4.1 Incoming Water Supply Checks
1. Turn OFF main isolator and follow LOTO procedures.
Failure to do so may result in Injury or Death.
2.
The water connections are to be completed by a licensed and experienced person.
3.
Confirm that the base tray is free of debris and clean.
4.
Confirm that the drain pipework is connected and sealed.
5.
Confirm that incoming water lines where flushed prior to de-isolating ball valve for unit water supply.
6. Check the incoming pressure to the unit is at least 220kPa and not exceeding 1400kPa.
7.
Confirm that there is sufficient flow to the unit so that all pumps can operate at 100% demand.
4.4 2 Internal Water Checks
1.
Open the ball valve controlling supply to the unit.
2.
Allow the reservoir to fill to 5mm below the overflow line and confirm that the float valve shuts off the incoming
supply.
3. Allow for the reservoir to remain full for a minimum of 30 minutes periodically checking for leaks.
4.
By pushing the ball float down confirm that the overflow/drain works.
5.
If an automatic drain valve has been provided activate the solenoid to test functionality. Refer to Auto Drain Valve
manual for instructions.
4.5 START UP PROCEDURE
1.
Turn blower by hand and check that all moving parts run freely.
CAUTION: Do not put fingers through the
blades at any point.
2.
Turn off power isolating switch and remove pad assemblies from the cooler.
3.
Check fan/motor belt deflection and adjust if necessary
4. If necessary, wash out reservoir.
5. Check operation of isolation switch.
6.
Check and set water distribution by adjusting the water restrictor in the hose from the cooler’s water pump to the
distribution pipe. Set to ½ open initially with adjustment of the saturation of the cooling pads outlined in 4.6 Setting
Pad Saturation.
7.
Measuring the flow rate from the water bleed. Using Table 4: Bleed Off Rate adjust the bleed valve to fill 1L in the
time shown according to the air flow rate and hardness of the water.
Note:- Formation of salt deposit in cooler pads indicates insufficient bleed off.
BLEED OFF RATE SETTING IN SECONDS (INTERPOLATE FOR OTHER AIR QUANTITIES)
Air Quantity l/s
2300
3600
5200
10000
14000
18000
Water Quality
Time
Seconds/L
240
200
120
80
60
45
Soft
40-100 mg/L
Time
Seconds/L
120
100
60
40
30
22
Average
100-400 mg/L
Time
Seconds/L
60
50
30
20
15
11
Hard
400+ mg/L
8. Check and ensure sufficient air relief is available via operable windows and/or doors in the cooled area. Required
relief calculations as per 2.5.7 Relief Area Calculation.
9. Check that sufficient relief area is provided for a full load current check. Load test motor with a Tong-test or clip-on
ammeter. If the motor amps are over the rating plate adjust pulley ratio or increase duct pressure drop to reduce
amps to equal to
or
below ratings as shown on fan motor compliance plate. Pulley ratio change is the responsibility
of the installer.
10. Run pump for five minutes to ensure the pads are saturated with water. Run fan on high for five minutes. Shut
down unit and isolate power following LOTO procedures. Remove pads and check that fan motor, pump motor, fan
etc. are not being splashed with water.
11. Check belt tensions and pulley alignment and adjust if necessary. Check to ensure that the blower wheel has not
shifted. If unsure please contact a Seeley International service agent.
12. Ensure that a maintenance schedule is prepared in accordance with suppliers’ recommendations and requirements
of local authorities.
COMMISSIONING INFORMATION
Table 4: Bleed Off Rate
